dragging image causes zoom change

Over this past summer, when I am moving the image on the page to view the top, bottom, left or right part of the image, the dragging motion (Click, hold, and move) frequently results in a zoom change and reloads the image. It happens often, sometimes multiple times on the same image. I use firefox and chrome--it happens on both. I've also tried changing the mouse and logging in to a different computer and it still happens.

I've only had this problem in recent months, never before, if that helps.

Thanks for your time,
Lynn
 
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